An ideal gas is expanding such that $\mathrm{PT}^2=$ constant. The coefficient of volume expansion of the gas is
  • A$\frac{1}{\mathrm{~T}}$
  • B$\frac{2}{\mathrm{~T}}$
  • C$\frac{3}{\mathrm{~T}}$
  • D$\frac{4}{\mathrm{~T}}$
IIT 2008, Easy
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